Methods and apparatus for automatically provisioning resources within a distributed control plane of a switch

ABSTRACT

In some embodiments, a network management module is operatively coupled to a set of edge devices that are coupled to a set of peripheral processing devices. The network management module can receive a signal associated with a broadcast protocol from an edge device from the set of edge devices in response to that edge device being operatively coupled to a switch fabric. The network management module can provision that edge device in response to receiving the signal. The network management module can define multiple network control entities at the set of edge devices such that each network control entity from the multiple network control entities can provide forwarding-state information associated with at least one peripheral processing device from the set of peripheral processing devices to at least one remaining network control entity from the multiple network control entities using a selective protocol.

RELATED APPLICATION

This application claims priority to, and the benefit of U.S. Provisional Patent Application Ser. No. 61/316,720, filed on Mar. 23, 2010, and entitled “Methods And Apparatus Related To Distributed Control Plane Switch Management.”

BACKGROUND

Some embodiments described herein relate generally to distributed switch fabric systems, and, in particular, to automatically provisioning resources and transmitting forwarding-state information in a distributed switch fabric system.

Some known networking systems use a targeted routing protocol to distribute forwarding-state information between different nodes within the networking system. Such known networking systems, however, do not automatically provision the nodes of the network system. Similarly stated, such known networking systems do not automatically provide identifiers and/or addresses of each node to the other nodes within the networking system. Accordingly, to transmit forwarding-state information between the nodes within the networking system, a system administrator manually configures each node within the networking system with the addresses and/or identifiers of the remaining nodes within the networking system.

In networking systems having a large number of nodes and/or in networking systems in which the topology frequently changes, manually configuring each node within the system can be time and/or labor intensive. Additionally, errors can be accidentally input into a configuration file by the system administrator during manual configuration.

Accordingly, a need exists for apparatus and methods to automatically provision a switch fabric system such that the nodes within the switch fabric system can exchange forwarding-state information using a targeted protocol.

SUMMARY

In some embodiments, a network management module is operatively coupled to a set of edge devices that are coupled to a set of peripheral processing devices. The network management module can receive a signal associated with a broadcast protocol from an edge device from the set of edge devices in response to that edge device being operatively coupled to a switch fabric. The network management module can provision that edge device in response to receiving the signal. The network management module can define multiple network control entities at the set of edge devices such that each network control entity from the multiple network control entities can provide forwarding-state information associated with at least one peripheral processing device from the set of peripheral processing devices to at least one remaining network control entity from the multiple network control entities using a selective protocol.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of a switch fabric system, according to an embodiment.

FIG. 2 is a schematic illustration of an edge device, according to another embodiment.

FIG. 3 is a schematic illustration of a control plane of a switch fabric system prior to provisioning, according to another embodiment.

FIG. 4 is a schematic illustration of a physical topology of the control plane of the switch fabric system of FIG. 3, after provisioning.

FIG. 5 is a schematic illustration of a logical topology of the control plane of the switch fabric system of FIG. 4, after provisioning.

FIG. 6 is a flow chart illustrating a method of transmitting initiation signals and forwarding-state information between edge devices using a broadcast protocol and a selective protocol, respectively, according to another embodiment.

DETAILED DESCRIPTION

In some embodiments, a network management module is operatively coupled to a set of edge devices coupled to a set of peripheral processing devices. The network management module can receive a signal associated with a broadcast protocol from an edge device from the set of edge devices in response to that edge device being operatively coupled to a switch fabric. The network management module can provision that edge device in response to receiving the signal. The network management module can define multiple network control entities at the set of edge devices such that each network control entity from the multiple network control entities can provide forwarding-state information associated with at least one peripheral processing device from the set of peripheral processing devices to at least one remaining network control entity from the multiple network control entities using a selective protocol.

By automatically provisioning each edge device using a broadcast protocol, an identifier and/or address associated with each network control entity can be automatically provided to the other network control entities within a switch fabric system. Accordingly, each network control entity within the switch fabric system can provide forwarding-state information to other network control entities within the switch fabric system without a system operator and/or administrator manually configuring the network control entities as peers. For example, Intermediate System-to-Intermediate System (IS-IS) can be used with Type Length Value (TLV) fields to configure the network control entities as Border Gateway Protocol (BGP) peers. BGP-format messages can then be used to transmit the forwarding-state information between the network control entities.

In some embodiments, a non-transitory processor-readable medium stores code representing instructions to cause a processor to send a first signal indicating that an edge device has been operatively coupled to a switch fabric system defining multiple virtual switch fabric systems. The first signal is based on a broadcast protocol. The code represents instructions to cause the processor to receive a second signal from a network management module. The second signal causes the edge device to initiate a first network control entity at the edge device. The second signal assigns to the first network control entity a device identifier and a virtual switch fabric system identifier associated with a virtual switch fabric system from the multiple virtual switch fabric systems. The first network control entity manages at least a portion of the edge device. The code represents instructions to cause the processor to send, using the first network control entity, forwarding-state information associated with a peripheral processing device operatively coupled to the edge device to a second network control entity associated with the virtual switch fabric system, using a selective protocol.

In some embodiments, a switch fabric system includes a set of edge devices associated with a network and operatively coupled to a switch fabric and multiple peripheral processing devices. A first edge device from the set of edge devices can send a broadcast signal to a set of devices associated with the network when the first edge device is initially coupled to the network. A network management module can automatically provision the first edge device from the set of edge devices in response to receiving the broadcast signal. The network management module defines a first network control entity at the first edge device from the set of edge devices and a second network control entity at a second edge device from the set of edge devices. A first set of peripheral processing devices from the multiple peripheral processing devices is associated with the first network control entity, and a second set of peripheral processing devices from the multiple peripheral processing devices is associated with the second network control entity. The first network control entity sends forwarding-state information associated with the first set of peripheral processing devices to the second network control entity using a selective protocol.

Embodiments shown and described herein are often discussed in reference to multiple layers (e.g., data link layer, network layer, physical layer, application layer, etc.). Such layers can be defined by open systems interconnection (OSI) model. Accordingly, the physical layer can be a lower level layer than the data link layer. Additionally, the data link layer can be a lower level layer than the network layer and the application layer. Further, different protocols can be associated with and/or implemented at different layers within the OSI model. For example, an Ethernet protocol, a Fibre Channel protocol and/or a cell-based protocol (e.g., used within a data plane portion of a communications network) can be associated with and/or implemented at a data link layer, while a Border Gateway Protocol (BGP) can be associated with and/or implemented at a higher layer, such as, for example, an application layer. While BGP can be implemented at the application layer, it can be used, for example, to send forwarding-state information used to populate a routing table associated with a network layer.

As used herein, the term “physical hop” can include a physical link between two modules and/or devices. For example, a communication path operatively coupling a first module with a second module can be said to be a physical hop. Similarly stated, a physical hop can physically link the first module with the second module.

As used herein, the term “single physical hop” can include a direct physical connection between two modules and/or devices in a system. Similarly stated, a single physical hop can include a link via which two modules are coupled without intermediate modules. Accordingly, for example, if a first module is coupled to a second module via a single physical hop, the first module can send data packets directly to the second module without sending the data packets through intervening modules.

As used herein, the tell “single logical hop” means a physical hop and/or group of physical hops that are a single hop within a network topology associated with a first protocol (e.g., a first data link layer protocol). Similarly stated, according to the network topology associated with the first protocol, no intervening nodes exist between a first module and/or device operatively coupled to a second module and/or device via the physical hop and/or the group of physical hops. A first module and/or device connected to a second module and/or device via a single logical hop can send a data packet to the second module and/or device using a destination address associated with the first protocol and the second module and/or device, regardless of the number of physical hops between the first device and the second device. In some embodiments, for example, a second protocol (e.g., a second data link layer protocol) can use the destination address of the first protocol (e.g., the first data link layer protocol) to route a data packet and/or cell from the first module and/or device to the second module and/or device over the single logical hop. Similarly stated, when a first module and/or device sends data to a second module and/or device via a single logical hop of a first protocol, the first module and/or device treats the single logical hop as if it is sending the data directly to the second module and/or device. In some embodiments, for example, the first protocol can be a packet-based data link layer protocol (i.e., that transmits variable length data packets and/or frames) and the second protocol can be a cell-based data link layer protocol (i.e., that transmits fixed length data cells and/or frames).

In some embodiments, a switch fabric can function as part of a single logical hop (e.g., a single large-scale consolidated layer-2 (L2)/layer-3 (L3) switch). Portions of the switch fabric can be physically distributed across, for example, many chassis and/or modules interconnected by multiple physical hops. In some embodiments, for example, a processing stage of the switch fabric can be included in a first chassis and another processing stage of the switch fabric can be included in a second chassis. Both of the processing stages can logically function as part of a single consolidated switch (e.g., within the same logical hop according to a first protocol) but include a separate single physical hop between respective pairs of processing stages. Similarly stated, each stage within a switch fabric can be connected to adjacent stage(s) by physical links while operating collectively as a single logical hop associated with a protocol used to route data outside the switch fabric. Additionally, packet classification and forwarding associated with a protocol (e.g., Ethernet) used to route data outside a single logical hop need not occur at each stage within the single logical hop. In some embodiments, for example, packet classification and forwarding associated with a first protocol (e.g., Ethernet) can occur prior to a module and/or device sending the data packet to another module and/or device via the single logical hop.

As used in this specification, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, the term “a module” is intended to mean a single module or a combination of modules.

FIG. 1 is a schematic illustration of a switch fabric system 100, according to an embodiment. The switch fabric system 100 includes a switch fabric 102, network management module 160, and multiple edge devices 182, 184, 186. The switch fabric system 100 operatively couples multiple peripheral processing devices 114, 124, 134 to each other. The peripheral processing devices 114, 124, 134 can be, for example, compute nodes, service nodes, routers, and storage nodes, as described in further detail herein. In some embodiments, for example, the peripheral processing devices 114, 124, 134 include servers, storage devices, gateways, workstations, and/or the like.

The peripheral processing devices 114, 124, 134 can be operatively coupled to the edge devices 182, 184, 186 of the switch fabric system 100 using any suitable connection such as, for example, an optical connection (e.g., an optical cable and optical connectors), an electrical connection (e.g., an electrical cable and electrical connectors) and/or the like. As such, the peripheral processing devices 114, 124, 134 can send data (e.g., data packets, data cells, etc.) to and receive data from the switch fabric system 100 via the edge devices 182, 184, 186. In some embodiments, the connection between the peripheral processing devices 114, 124, 134 and the edge devices 182, 184, 186 is a direct link. Such a link can be said to be a single physical hop link. In other embodiments, the peripheral processing devices can be operatively coupled to the edge devices via intermediate modules. Such a connection can be said to be a multiple physical hop link.

Each edge device 182, 184, 186 can be any device that operatively couples peripheral processing devices 114, 124, 134 to the switch fabric 102. In some embodiments, for example, the edge devices 182, 184, 186 can be access switches, input/output modules, top-of-rack devices and/or the like. Structurally, the edge devices 182, 184, 186 can function as both source edge devices and destination edge devices. Accordingly, the edge devices 182, 184, 186 can send data (e.g., a data stream of data packets and/or data cells) to and receive data from the switch fabric 102, and to and from the connected peripheral processing devices 114, 124, 134.

In some embodiments, the edge devices 182, 184, 186 can be a combination of hardware modules and software modules (executing in hardware). In some embodiments, for example, each edge device 182, 184, 186 can include a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processor (DSP) and/or the like.

Each of the edge devices 182, 184, 186 can communicate with the other edge devices 182, 184, 186 via the switch fabric 102. Specifically, the switch fabric 102 provides any-to-any connectivity between the edge devices 182, 184, 186 at relatively low latency. For example, switch fabric 102 can transmit (e.g., convey) data between edge devices 182, 184, 186. In some embodiments, the switch fabric 102 can have at least hundreds or thousands of ports (e.g., egress ports and/or ingress ports) through which edge devices such as edge devices 182, 184, 186 can transmit and/or receive data.

FIG. 2 is a system block diagram of an edge device 200 similar to the edge devices 182, 184, 186. The edge device 200 includes processor 251, memory 252, line card 210, line card 220, and port 231. Processor 251 is operatively coupled to memory 252, line card 210, line card 220 and port 231. Line card 210 includes ports 211 and 212. Line card 220 includes ports 221 and 222. In some embodiments, line cards 210 and/or 220 include one or more processors and/or memories (not shown).

Ports 211, 212, 221 and 222 can be similar to the ports of the edge devices 182, 184, 186 operatively coupled to peripheral processing devices 114, 124, 134. For example, ports 211, 212, 221 and 222 can implement a physical layer using twisted-pair electrical signaling via electrical cables or fiber-optic signaling via fiber-optic cables. In some embodiments, some of ports 211, 212, 221 and 222 implement one physical layer such as twisted-pair electrical signaling and others of ports 211, 212, 221 and 222 implement a different physical layer such as fiber-optic signaling. Furthermore, ports 211, 212, 221 and 222 can be configured to allow edge device 200 to communicate with peripheral processing devices, such as, for example, computer servers (servers), via a common protocol such as Ethernet or Fibre Channel. In some embodiments, some of ports 211, 212, 221 and 222 implement one protocol such as Ethernet and others of ports 211, 212, 221 and 222 implement a different protocol such as Fibre Channel. Thus, edge device 200 can be in communication with multiple peripheral processing devices using homogeneous or heterogeneous physical layers and/or protocols via ports 211, 212, 221 and 222.

Port 231 can be configured to be in communication with other edge devices via a communications network such as switch fabric 102. Port 231 can be part of one or more network interface devices (e.g., a 40 Gigabit (Gb) Ethernet interface, a 100 Gb Ethernet interface, etc.) through which the edge device 200 can send signals to and/or receive signals from a communications network. The signals can be sent to and/or received from the communications network via an electrical link, an optical link and/or a wireless link operatively coupled to the edge device 200. In some embodiments, the edge device 200 can be configured to send signals to and/or receive signals from the communications network based on one or more protocols (e.g., an Ethernet protocol, a multi-protocol label switching (MPLS) protocol, a Fibre Channel protocol, a Fibre-Channel-over Ethernet protocol, an Infiniband-related protocol, a cell-base protocol).

In some embodiments, port 231 can implement a different physical layer and/or protocol than those implemented at ports 211, 212, 221 and 222. For example, port 211, 212, 221 and 222 can be configured to communicate with peripheral processing devices using a data link layer protocol based on data packets, and port 231 can be configured to communicate via a switch fabric (e.g., switch fabric 102) using a data link layer protocol based on data cells. Said differently, edge device 200 can be an edge device of a network switch such as a distributed network switch.

In some embodiments, the edge device 200 can be configured to prepare a data packet (e.g., an Ethernet frame and/or packet) to enter a data plane portion of a communications network (e.g., switch fabric 102). For example, the edge device 200 can be configured to forward, classify, and/or modify the packet encapsulation (e.g., modify, add and/or remove a header portion, footer portion and/or any other identifier included within the data packet) of a data packet prior to sending the data packet to the communications network. Additionally, the edge device 200 can be configured to partition and/or divide the data packet into data cells (e.g., having fixed length payloads) prior to sending the data cells to the switch fabric. Additional details related to packet classification are described in U.S. patent application Ser. No. 12/242,168 entitled “Methods and Apparatus Related to Packet Classification Associated with a Multi-Stage Switch,” filed Sep. 30, 2008, and U.S. patent application Ser. No. 12/242,172, entitled “Methods and Apparatus for Packet Classification Based on Policy Vectors,” filed Sep. 30, 2008, both of which are incorporated herein by reference in their entireties.

Returning to FIG. 1, the edge devices 182, 184, 186 can host one or more network control entities 192, 194, 196 to manage the ports of the edge devices 182, 184, 186. For example, as described in further detail herein, the edge device 182 can host the network control entity 192 to manage the ports to which the peripheral processing devices 114 are coupled, the edge device 184 can host the network control entity 194 to manage the ports to which the peripheral processing devices 124 are coupled, and the edge device 186 can host the network control entity 196 to manage the ports to which the peripheral processing devices 134 are coupled. As such the peripheral processing devices 114, 124, and 134 can be said to be associated with the network control entities 192, 194, and 196, respectively. Each network control entity 192, 194, 196 can be a process, application, virtual machine and/or some other software module (executing in hardware), or a hardware module, that is executed at the edge devices 182, 184, 186, respectively.

Each network control entity 192, 194, 196 can send and/or distribute forwarding-state information (e.g., port identifiers, network segment identifiers, peripheral processing device identifiers, edge device identifiers, data plane module identifiers, next hop references, next hop identifiers, etc.) over the control plane for a set of ports that network control entity 192, 194, 196 manages. As discussed in further detail herein, for example, the network control entity 196 can send, via the control plane, forwarding-state information associated with the port at edge device 182 to which the peripheral processing device 134′ is coupled, to the network control entity 194. Using the received forwarding-state information, the edge device 184 can address and send a data packet received from the peripheral processing device 124′ to the edge device 186, via the switch fabric 102.

In some embodiments and as described in further detail herein, the network control entity 196 can send forwarding-state information to the network control entity 194 using a targeted higher level protocol (e.g., an application layer protocol) such as, for example, Border Gateway Protocol (BGP). In such embodiments, the network control entity 196 can send the forwarding-state information using such a higher level protocol in conjunction with any suitable lower level protocol (e.g., a data link layer protocol), such as, for example, Ethernet and/or Fibre Channel. While BGP can be implemented at the application layer, it can be used to send forwarding-state information used to populate a routing table (e.g., at the network control entity 194) associated with a network layer. Using a targeted protocol, such as BGP, the network control entity 192 can send the forwarding-state information to specific network control entities (e.g., 194) while refraining from sending the forwarding-state information to other network control entities (e.g., 192).

In some embodiments, a network control entity 192, 194, 196 can control and/or manage ports at an edge device 182, 184, 186 at which the network control entity 192, 194, 196 is located. In other embodiments, a network control entity can also control and/or manage ports and/or data plane modules at an edge device other than the edge device at which the network control entity is located. In such embodiments, the network management module 160 has flexibility to assign each port to a network control entity 192, 194, 196 based on processing capacity, as described in further detail herein. Additionally, in such embodiments, the network management module 160 is not constrained by the physical location of the network control entities 192, 194, 196 and/or the ports when assigning the ports to a network control entity 192, 194, 196. Moreover, while each edge device 182, 184, 186 is shown in FIG. 1 as hosting a single network control entity 192, 194, 196, in other embodiments, each edge device 182, 184, 186 can host and/or include any number of network control entities.

In some embodiments, the ports associated with multiple network control entities 192, 194, 196 can form a virtual switch fabric system. Such a virtual switch fabric system can be a group and/or collection of network control entities (and their associated ports) that share forwarding-state information with the other network control entities within the virtual switch fabric system, but not those network control entities outside of the same virtual switch fabric system. A rule and/or policy implemented at a network control entity 192, 194, 196 and/or the network management module 160 can prevent and/or restrict a network control entity of a first virtual switch fabric system from sending forwarding-state information to a network control entity of a second virtual switch fabric system. Accordingly, because forwarding-state information is not exchanged between the network control entities of the first virtual switch fabric system and the network control entities of the second virtual switch fabric system, the peripheral processing devices operatively coupled to ports associated with the network control entities of the first virtual switch fabric system do not send data packets to the peripheral processing devices operatively coupled to ports associated with the network control entities of the second virtual switch fabric system. For example, a first organization assigned to a first virtual switch fabric system can protect data transmitted over switch fabric 102 from being sent to and/or viewed by a second organization associated with a second virtual switch fabric system. Each network control entity within a given virtual switch fabric system can be assigned a virtual switch fabric identifier by network management module 160. In some embodiments, the virtual switch fabric identifier can be provided by network management module 160. In some embodiments, a virtual switch fabric system can also be referred to as a network segment, a sub-network or a virtual network.

In some embodiments, network management module 160 can be a process, application, virtual machine and/or some other software module (executing in hardware), or a hardware module, that is executed at a compute node (not shown in FIG. 1), an edge device 182, 184, 186, and/or any other device within the switch fabric system 100. In other embodiments, network management module 160 can include a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processor (DSP) and/or the like. Although network management module 160 can be logically centralized, the implementation of network management module 160 can be highly distributed, for example, for reliability. For example, portions of network management module 160 can be physically distributed across, for example, many chassis.

The network management module 160 can be operatively coupled to the edge devices 182, 184, 186 via a control plane (not shown in FIG. 1) of the switch fabric system 100. In some embodiments, such a control plane can include direct, single physical hop connections between the network management module 160 and the edge devices 182, 184, 186. In other embodiments, the control plane includes a multiple physical hop network that operatively couples the network management module 160 with the edge devices 182, 184, 186.

Network management module 160 can provision edge devices 182, 184, 186 when the edge devices 182, 184, 186 are initially coupled to the switch fabric system 100. More specifically, as described in further detail herein, when an edge device is initially connected to the switch fabric system 100, network management module 160 can assign a device identifier to this newly connected edge device. Such a device identifier can be, for example, a physical address (e.g., media access control (MAC), etc.), a logical address (e.g., internet protocol (IP), etc.) and/or any other suitable address. In some embodiments the device identifier is assigned using a dynamic address assigning protocol (e.g., Dynamic Host Configuration Protocol (DHCP), etc.). As discussed in further detail herein, an initiation signal and/or a provisioning signal can be formatted and sent from an edge device 182, 184, 186 to the network management module 160 or from the network management module 160 to an edge device 182, 184, 186, respectively, using a broadcast protocol such as, for example, an Intermediate System to Intermediate System (IS-IS) protocol. In such embodiments, provisioning information can be encoded as a type-length-value (TLV) element inside the initiation signal and/or provisioning signal.

In some embodiments, the network management module 160 can assign and/or associate other identifiers to the newly-connected edge device. In some embodiments, for example, the network management module 160 can assign a virtual switch fabric system identifier, associating that edge device with a particular virtual switch fabric system. In other embodiments, any other identifier and/or association can be assigned to the newly-connected edge device by the network management module 160.

In some embodiments, the network management module 160 can also monitor an available processing capacity of each network control entity 182, 184, 186 and initiate and/or terminate network control entities 182, 184, 186 when an available processing capacity of a network control entity 182, 184, 186 crosses (e.g., falls below) a first threshold and/or crosses (e.g., exceeds) a second threshold, respectively. Such initiation and termination of network control entities can be similar to that described in co-pending U.S. patent application Ser. No. 12/968,848, filed on Dec. 15, 2010, and entitled “Methods and Apparatus for Dynamic Resource Management within a Distributed Control Plane of a Switch,” which is incorporated herein by reference in its entirety. Additionally, the network management module 160 can reassign ports to different network control entities as the available processing capacities of the network control entities 182, 184, 186 fluctuate.

The switch fabric 102 can be any suitable switch fabric that operatively couples the edge devices 182, 184, 186 to the other edge devices 182, 184, 186. In some embodiments, for example, the switch fabric 102 can be a Clos network (e.g., a non-blocking Clos network, a strict sense non-blocking Clos network, a Benes network) having multiple stages of switching modules (e.g., integrated Ethernet switches). In some embodiments, for example, the switch fabric 102 shown in FIG. 1 can include any number of stages. In such embodiments, for example, the switch fabric 102 can include five, seven or nine stages. The switch fabric 102 can be, for example, part of a core portion of a data center similar to the core portion of the data center described in co-pending U.S. patent application Ser. No. 12/495,337, filed Jun. 30, 2009, and entitled “Methods and Apparatus Related to Any-to-Any Connectivity Within a Data Center,” which is incorporated herein by reference in its entirety.

In some embodiments, the switch fabric 102 can be (e.g., can function as) a single consolidated switch (e.g., a single large-scale consolidated L2/L3 switch). In other words, the switch fabric 102 can operate as a single logical entity (e.g., a single logical network element). Similarly stated, the switch fabric 102 can be part of a single logical hop between a first edge device 182, 184, 186 and a second edge device 182, 184, 186 (e.g., along with the data paths between the edge devices 182, 184, 186 and the switch fabric 102). The switch fabric 102 can connect (e.g., facilitate communication between) the peripheral processing devices 114, 124, 134. In some embodiments, the switch fabric 102 can communicate via interface devices (not shown) that transmit data at a rate of at least 10 Gb/s. In some embodiments, the switch fabric 102 can communicate via interface devices (e.g., Fibre-Channel interface devices) that transmit data at a rate of, for example, 2 Gb/s, 4, Gb/s, 8 Gb/s, 10 Gb/s, 40 Gb/s, 100 Gb/s and/or faster link speeds.

Although the switch fabric 102 can be logically centralized, the implementation of the switch fabric 102 can be highly distributed, for example, for reliability. For example, portions of the switch fabric 102 can be physically distributed across, for example, many chassis. In some embodiments, for example, a processing stage of the switch fabric 102 can be included in a first chassis and another processing stage of the switch fabric 102 can be included in a second chassis. Both of the processing stages can logically function as part of a single consolidated switch (e.g., within the same logical hop) but have a separate single physical hop between respective pairs of processing stages.

In use, when an edge device (e.g., edge device 186) is initially connected to the switch fabric system 100, that edge device 186 can transmit an initiation signal over the control plane using a broadcast protocol (e.g., Intermediate System (IS-IS), Open Shortest Path First (OSPF), etc.) to the other devices connected to the control plane (e.g., network management module 160, edge devices 182, 184, 186) to indicate and/or advertise its presence. As described in further detail herein, the network management module 160 sends a provisioning signal back to that edge device 186. As discussed above and in further detail herein, such a provisioning signal can provide a device identifier and/or any other appropriate identifier and/or information to the edge device 186. Additionally, in some embodiments, the provisioning signal can initiate a network control entity 196 at the edge device 186 and assign that network control entity 196 to a virtual switch fabric system. In assigning the network control entity 196 to a virtual switch fabric, the network management module 160 can also provide the network control entity 196 an address and/or identifier of each of the other network control entities within that virtual switch fabric system. In other embodiments, the provisioning signal can assign the ports at the edge device 186 to a network control entity at another edge device 182, 184. As described in further detail herein, in some embodiments, such initiation and/or provisioning information can be provided in a TLV portion of an IS-IS message.

After provisioning is complete, the network control entity 196 can use a selective protocol (e.g., Border Gateway Protocol and/or the like) to provide forwarding-state information to the other network control entities associated with the same virtual switch fabric system but not to the network control entities outside of the same virtual switch fabric system. Such forwarding-state information (e.g., port identifiers, network segment identifiers, peripheral processing device identifiers, edge device identifiers, data plane module identifiers, next hop references, next hop identifiers, etc.) includes information related to and/or can be associated with the peripheral processing devices 134 operatively coupled to the edge device 186. The other network control entities associated with the same virtual switch fabric system as the edge device 186 can receive and store the forwarding-state information in a routing, switching and/or lookup table. Because a selective protocol, such as BGP, is used to send the forwarding-state information to the other network control entities, the network control entity 196 sends its forwarding-state information to the network control entities that are part of the same virtual switch fabric system without sending it to network control entities associated with other virtual switch fabric systems. Using a selective protocol also reduces the amount of traffic and/or congestion that would otherwise be on the control plane of the switch fabric system 100.

After forwarding-state information has been exchanged between network control entities of the same virtual switch fabric system, the network control entities can send and/or store the forwarding-state information at a data plane module of the edge devices having ports associated with each of the network control entities. For example, the network control entity 194 can store the forwarding-state information in a routing, switching and/or lookup table associated with a data plane module (not shown) of the edge device 184. More specifically, the network control entity 194 can store the forwarding-state information in a memory at the edge device 184 (e.g., memory 252 of FIG. 2) accessible by the data plane module of the edge device 184.

A data packet (e.g., an Ethernet packet) can be sent between peripheral processing devices 114, 124, 134 associated with the same virtual switch fabric system via the switch fabric system 100. For example, a data packet can be sent from a first peripheral processing device 124′ to a second peripheral processing device 134′ via path 195 through the data plane of the switch fabric system 100. Peripheral processing device 124′ transmits the data packet to the data plane module (not shown) at the edge device 184. Such a data packet includes a header with the device identifier of destination peripheral processing device 134′. The data plane module of the edge device 184 can retrieve the forwarding-state information associated with the peripheral processing device 134′ from the lookup, routing and/or switching table stored in a memory of the edge device 184. More specifically, the data plane module at the edge device 184 can use a destination identifier associated with the peripheral processing device 134′ and in a header portion of the data packet to query the lookup, routing and/or switching table for the appropriate forwarding-state information. The data plane module can then append such forwarding-state information to the data packet and send the data packet to the switch fabric 102. The switch fabric can use the appended forwarding-state information to route and/or switch the data packet through the switch fabric and to the edge device 186. The edge device 186 can then prepare and send the data packet to the peripheral processing device 134′.

In some embodiments, prior to being sent to the switch fabric 102, the edge device 184 can divide and/or partition the data packet into one or more data cells (e.g., fixed length frames of data). The cells can be forwarded, routed and/or switched to the edge device 186 via the switch fabric 102. The edge device 186 can reassemble the data packet from the data cells prior to sending the data packet to the peripheral processing device 134′.

FIGS. 3-5 are system block diagrams of a control plane 300 of a switch fabric system, similar to switch fabric system 100, according to an embodiment. FIG. 3 illustrates the control plane 300 during provisioning of the edge device 320. Edge devices 310, 320 and 330 are similar to edge devices 182, 184, 186 and 200, and network management module 355 is similar to network management module 160 described above with respect to FIGS. 1 and 2. As shown in FIG. 3, network management module 355 is hosted at a compute device 350. Compute device 350 can include, for example, a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), a digital signal processor (DSP) and/or the like. In some embodiments, the compute device 350 is a server having a processor running software stored in memory that implements the network management module 355.

Data paths 305 operatively couple the edge devices 310, 320, 330 and the compute device 350 with each other. The data paths 305 can include optical links, electrical links, wireless links and/or the like. Accordingly, the edge devices 310, 320, 330 and/or the compute device 350 can send signals to and/or receive signals from the other edge devices 310, 320, 330 and/or the compute device 350 via the control plane connections (i.e., data paths 305). In some embodiments and as shown in FIG. 3, the connections (i.e., data paths 305) between the edge devices 310, 320, 330 and compute device 350 are direct links. Such links can be said to be single physical hop links. In other embodiments, the connection between each pair of edge devices and/or between an edge device and the compute device can be via intermediate modules using, for example, route reflector(s) (e.g., BGP route reflectors) and/or other nodes within a network. Such a connection can be said to be a multiple physical hop link. In such embodiments, the control plane 300 can be hierarchical, similar to the control planes shown and described in co-pending U.S. patent application Ser. No. 12/968,957, filed on Dec. 15, 2010, and entitled “Methods and Apparatus Related to a Switch Fabric System having a Multi-Hop Distributed Control Plane and a Single-Hop Data Plane,” which is incorporated herein by reference in its entirety.

In some embodiments, an address and/or identifier (e.g., a MAC address, IP address, etc.) of network management module 355 can be dynamic. Similarly stated, the address and/or identifier of the network management module 355 is not fixed and can change each time the network management module 355 and/or the compute device 350 reboots and/or is reconfigured. In such a manner, the address of the network management module 355 can adapt and/or be established according to the characteristics and/or requirements of the specific switch fabric system. In other embodiments, the address and/or identifier of the network management module 355 can be fixed such that it remains the same each time the compute device 350 reboots and/or is reconfigured.

Additionally, as described in further detail herein, the network management module 355 can be configured to listen for initiation signals (e.g., initiation signal 362) sent over the control plane on a fixed multicast address. In some embodiments, such a fixed multicast address can be the same each time the network management module 355 and/or the compute device 350 reboots and/or is reconfigured. In other embodiments, the multicast address can be dynamic such that it does not remain the same each time the network management module 355 and/or the compute device 350 reboots and/or is reconfigured.

In use, a network administrator and/or other user can physically couple an edge device (e.g., edge device 320) to the switch fabric system. Such a physical connection couples the edge device 320 to the compute device 350 and the other edge devices 310, 330 within in the control plane 300 of the switch fabric system. Similarly stated, physical connections (e.g., data paths 305) are established between the edge device 320 and the compute device 350 and the other edge devices 310, 330. Additionally, in some embodiments, the edge device 320 is operatively coupled to a data plane of the switch fabric system (i.e., a switch fabric similar to switch fabric 102) when the network administrator and/or other user physically couples the edge device 320 to the switch fabric system.

After the edge device 320 is physically coupled to the switch fabric system, the edge device 320 can send within the control plane 300 an initiation signal 362 to the other devices (e.g., edge devices 310, 330 and compute device 350) on the fixed multicast address using a broadcast protocol (e.g., IS-IS, OSPF, etc.). Similarly stated, the edge device 320 can broadcast its presence in the switch fabric system over the control plane 300. Because a broadcast protocol (e.g., IS-IS, OSPF, etc.) is used to send the initiation signal, the network management module 355 can have a dynamic address and/or identifier, as described above. In other embodiments, the network management module 355 can have a fixed address and/or identifier and the initiation signal can be sent to that address using a targeted protocol (e.g., the initiation signal can be sent to the network management module 355 without being sent to the other edge devices 310, 330).

The initiation signal 362 can include any suitable information to be used by the network management module 355 to provision the edge device 320. In some embodiments, for example, the initiation information can include a type of ports (e.g., Fibre-Channel, Ethernet, etc.) of the edge device 320, the speed of the ports of the edge device 320, information associated with the peripheral processing devices operatively coupled to the ports of the edge device, the port, slot and/or chassis of the switch fabric system to which the edge device 320 is coupled, and/or the like.

In some embodiments, such initiation information can be included within a type-length-value (TLV) portion of an IS-IS message. A TLV portion of a message can represent the data by indicating the type of data (e.g., type of ports, speed of the ports, etc.), the length of the data (e.g., the size), followed by the value of the data (e.g., an identifier indicating the type of ports, the speed of the ports, etc.). Accordingly, using TLV portions of a message, the types, lengths and values of the initiation information can be easily parsed by the network management module.

The network management module 355 can actively listen on and/or monitor a fixed multicast address for initiation signals, such as initiation signal 362. Accordingly, when the edge device 320 sends the initiation signal 362 on the fixed multicast address, the network management module 355 can receive the initiation signal 362. In some embodiments, the other edge devices 310, 330 are configured to discard initiation signals received on the fixed multicast address. In other embodiments, the other edge devices 310, 330 can receive the initiation signals at the fixed multicast address and store the information contained therein.

The network management module 355 can provision the edge device 320 based on the initiation signal 362. In some embodiments, for example, the network management module 355 can assign a device identifier and/or address to the edge device 320 and/or the ports of the edge device 320. Additionally, as shown in FIGS. 4 and 5 and as described in further detail herein, the network management module 355 can also initiate one or more network control entities 321, 322 at the edge device 320 and assign ports 325-328 at that edge device 320 to the network control entities 321, 322. Additionally, the network management module 355 can assign one or more ports 315 at another edge device 310 to one or more of the network control entities 322 at the edge device 320. Similarly, one or more of the ports at the edge device 320 can be assigned to a network control entity at another edge device. The network management module 355 can also assign the network control entities 321, 322 to be initiated at the edge device 320 addresses and/or identifiers (e.g., a MAC address and/or an IP address) as well as assigning the network control entities 321, 322 to a virtual switch fabric system. In some embodiments, the network management module 355 can assign the network control entities 321, 322 an identifier from which each network control entity 321, 322 can derive a MAC address and/or an IP address.

Returning to FIG. 3, such provisioning information, rules, policies and/or instructions can be sent by the network management module 355 to the edge devices 310, 320, 330 in response to the initiation signal 362. Specifically, a provisioning signal 364 can be sent to each edge device 310, 320, 330 containing such information using a broadcast protocol (e.g., IS-IS, OSPF, etc.). Similar to the initiation information, in some embodiments, such provisioning information, rules, policies and/or instructions can be encoded as a TLV portion of an IS-IS message. In such embodiments, the provisioning information can be easily parsed by the edge devices 310, 320, 330.

In some embodiments, the provisioning signal 364 is sent to the same multicast address as the initiation signal 362. In other embodiments, the provisioning signal 364 is sent to a different multicast address as the initiation signal 362. In either embodiment, the edge devices 310, 320, 330 (and/or the network control entities 312, 321, 322, 332 at the edge devices 310, 320, 330) can listen to and/or monitor the appropriate multicast address to receive the provisioning signal 364. As described in further detail herein, use of such a broadcast protocol allows the switch fabric system to be automatically provisioned such that network control entities within the switch fabric system can share forwarding-state information using a targeted protocol such as the Border Gateway Protocol (BGP). Similarly stated, the routing tables at the network control entities 312, 321, 322, 332 at the edge devices 310, 320, 330 can be automatically populated with the addresses and/or identifiers of the other network control entities 312, 321, 322, 332. As such, a system administrator does not need to manually configure the network control entities 312, 321, 322, 332 as BGP peers.

Upon receiving such provisioning information, for example, the edge device 320 can initiate the network control entities 321, 322 and/or the other edge devices 310, 330 can store the addresses and/or identifiers of the network control entities 321, 322. In some embodiments, any other suitable rules, policies, and/or identifiers can be provided to the edge device 320 to be provisioned and/or the other edge devices 310, 330 via the provisioning signal 364.

In some embodiments, before storing and/or implementing the information and/or instructions within the provisioning signal 364, the edge devices 310, 330 can parse the received provisioning signal 364 for virtual switch fabric identifiers associated with the network control entities 321, 322 to be initiated at the edge device 320. If the edge device 310 or 330 does not have a network control entity associated with the same virtual switch fabric system as one of the network control entities 321, 322, that edge device 310 or 330 can discard the provisioning signal 364. Alternatively, if that edge device 310 or 330 includes a network control entity associated with the same virtual switch fabric system as at least one of the network control entities 321, 322, that edge device 310 or 330 can store and/or implement the relevant portion of the provisioning signal 364.

After the edge device 320 has been provisioned (e.g., the network control entities 321, 322 initiated, the addresses and/or identifiers of the edge device 320 and/or the network control entities 321, 322 made available to the other edge devices 310, 330 and/or network control entities 312, 332, rules and/or policies implemented, and/or the like), the other edge devices 310 and/or the network control entities 312, 332 at the other edge devices 310, 330 can send addresses and/or identifiers to the edge device 320 and/or the network control entities 321, 322. In some embodiments, network control entities associated with a same virtual switch fabric system as the network control entities 321, 322 send such information to the network control entities 321, 322, while network control entities not associated with the same virtual switch fabric system do not send such information. In some embodiments, such information can be sent similar to forwarding-state information using a targeted protocol such as BGP. In other embodiments, such information is broadcast on a multicast address using a broadcast protocol, such as IS-IS. In such a manner the edge device 320 and/or the network control entities 321, 322 can receive the addresses and/or identifiers of the other edge devices 310, 330 within the switch fabric system.

FIGS. 4 and 5 illustrate the control plane 300 after the edge device 320 has been provisioned. FIG. 4 is a schematic illustration of a physical topology of the control plane 300. As shown in FIG. 4, the edge device 310 includes ports 315-318, the edge device 320 includes ports 325-328 and the edge device 330 includes the ports 335-337. The ports 315-318, 325-328, 335-337 can be any suitable ports configured to operatively couple the edge devices 310, 320, 330 to peripheral processing devices (not shown). In some embodiments, for example, the ports 315-318, 325-328, 335-337 can be similar to the ports 211, 212, 221 and 222 shown and described above with respect to FIG. 2.

Each of the edge devices 310, 320, 330 includes at least one network control entity 312, 321, 322, 332 to manage a group of ports 360, 362, 364, 366. Specifically, the edge device 310 includes network control entity 312 that manages the group of ports 366 (i.e., ports 316-318); the edge device 320 includes network control entity 321 that manages the group of ports 362 (i.e., ports 327 and 328) and the network control entity 322 that manages the group of ports 360 (i.e., ports 315, 325 and 326); and the edge device 330 includes network control entity 332 that manages the group of ports 364 (i.e., ports 335-337). While FIG. 4 shows each edge device 310, 320, 330 including at least one network control entity 312, 321, 322, 332, in other embodiments, some edge devices do not include network control entities.

A network control entity can manage forwarding-state information for all ports of an edge device, a subset of ports associated with an edge device, or a set of ports associated with two or more edge devices. For example, the group of ports 366 includes ports 316, 317, 318 located at edge device 310 and managed by network control entity 312, also located at edge device 310. Similarly, the group of ports 362 and the group of ports 364 both include ports 327-328 and 335-337 located at edge devices 320 and 330, respectively, and are managed by network control entities 321 and 332, respectively. The group of ports 360, however, includes ports 315, 325, 326 located at both edge device 310 and edge device 320. As shown in FIG. 4, network control entity 322 located at edge device 320 manages the group of ports 360. In other embodiments, each port of a group of ports is managed by a network control entity not on the same edge device as a port of the group of ports.

As described above, the network management module 355 can reassign network control entities by, for example, sending a provisioning signal over the control plane. For example, a port 315-318, 325-328, 335-337 can be assigned to a different network control entity 312, 322, 332 when available processing capacity at the currently assigned network control entity 312, 322, 332 crosses a threshold. In other embodiments, a port 315-318, 325-328, 335-337 can be reassigned to a different network control entity 312, 322, 332 to improve traffic flow over a portion of the control plane.

Peripheral processing devices can be operatively coupled to the ports 315-318, 325-328, 335-337 of the edge devices 310, 320, 330. Such peripheral processing devices can be similar to the peripheral processing devices 114, 124, 134, shown and described above with respect to FIG. 1. Accordingly, the peripheral processing devices can include compute nodes, service nodes, routers, and/or storage nodes.

FIG. 5 is a schematic illustration of a logical topology of the control plane of the switch fabric system of FIG. 4. As shown in FIG. 5, each network control entity 312, 321, 322, 332 is operatively coupled to the other network control entities 312, 321, 322, 332 via a logical connection 307. Such logical connections 307 can include one or more physical connections, intermediate nodes within the switch fabric system 300 and/or the like.

Each network control entity 312, 321, 322, 332 can send forwarding-state information (e.g., port identifiers, network segment identifiers, peripheral processing device identifiers, edge device identifiers, data plane module identifiers, next hop references, next hop identifiers, etc.) to the other network control entities 312, 321, 322, 332 via the logical connections 307. Consider the following example. The network control entity 321 can detect a change in state at the port 327. For example, after a peripheral processing device (not shown) is initially coupled to the port 327, the peripheral processing device can send forwarding-state information associated with that peripheral processing device to the network control entity 321. In some embodiments, such forwarding-state information can include a peripheral processing device identifier associated with the peripheral processing device, such as, for example, a media access control (MAC) address, an interne protocol (IP) address, and/or the like.

The network control entity 321 can update and/or revise its configuration table accordingly. The network control entity 321 can then send updated forwarding-state information 370 to the network control entity 322, as shown in FIG. 5. In some embodiments, such forwarding-state information 370 can include, for example, port identifiers of the ports 327, 328 associated with the network control entity 321, a port identifier associated with the updated status of port 327, a network segment identifier associated with a network segment with which the network control entity 321 is associated, peripheral processing device identifiers (e.g., MAC address, IP address, etc.) associated with the peripheral processing devices operatively coupled to the ports 327, 328, a peripheral processing device identifier associated with the updated peripheral processing device and/or the like.

In some embodiments, the network control entity 321 can send the forwarding-state information 370 to the network control entity 322 using a targeted higher level protocol (e.g., an application layer protocol) such as, for example, Border Gateway Protocol (BGP). In such embodiments, the network control entity 321 can use such a higher level protocol in conjunction with any suitable lower level protocol (e.g., a data link layer protocol), such as, for example, Ethernet and/or Fibre Channel, to send the forwarding-state information 370. While BGP can be implemented at the application layer, it can be used to send forwarding-state information used to populate a routing table (e.g., at the network control entity 322) associated with a network layer. Using a targeted protocol, such as BGP, the network control entity 321 can send the forwarding-state information 370 to specific network control entities (e.g., 322) while refraining from sending the forwarding-state information to other network control entities (e.g., 312).

In some embodiments, the network control entity 322 can store the forwarding-state information 370 received from the network control entity 321 in a memory associated with the network control entity 322. For example, the network control entity 322 can store the forwarding-state information 370 at the memory (e.g., memory 252 of FIG. 2) of the edge device 320 at which the network control entity 322 is located. Similarly stated, the network control entity 322 can update a configuration and/or forwarding-state table within the memory of the edge device 320 in response to receiving the forwarding-state information 370. In some embodiments, the forwarding-state information 370 can be stored at a portion of the memory of the edge device 320 allocated and/or partitioned for the network control entity 322.

The network control entity 322 can then send the updated forwarding-state information 370 to data plane modules (not shown) at the edge devices 320, 310 at which ports 315, 325, 326 associated with the network control entity 322 are located. In some embodiments, for example, the network control entity 322 can store the forwarding-state information 370 at a portion of the memory (e.g., within a routing table) of the edge device 320 allocated and/or partitioned for data, processes and/or applications associated with the data plane. In such embodiments, the memory of the edge device 320 can store the forwarding-state information 370 in a portion of the memory associated with the network control entity 322 as well as in a portion of the memory associated with the data plane module. In other embodiments, the forwarding-state information 370 is stored within a single location within the memory of the edge device 320 accessible by the applicable processes at the edge device 320 (including the network control entity 322 and the data plane module). The network control entity 322 also sends the forwarding-state information 370 to a data plane module at the edge device 310 (port 315 at edge device 310 is associated with the network control entity 322). Similar to the edge device 320, the edge device 310 can store the forwarding-state information within a memory (e.g., within a routing table). In such a manner, forwarding-state information can be distributed to the applicable data plane modules. Additionally, in such a manner, forwarding-state information can be updated at the network control entities 312, 321, 322, 332 each time the topology of the switch fabric system is updated.

In some embodiments, the network control entity 312 can be part of a different virtual switch fabric system (e.g., network segment) than the network control entities 321 and 322. In such embodiments, the network control entity 321 can send forwarding-state information 370 to the network control entities (e.g., 322) associated with the same virtual switch fabric system while refraining from sending the forwarding-state information to the network control entities (e.g., 312) outside of that virtual switch fabric system and/or associated with another virtual switch fabric system. In such a manner, multiple virtual switch fabric systems (e.g., network segments) can be defined within the switch fabric system 300. In other embodiments, the network control entity 321 also sends the updated forwarding-state information 370 to the network control entity 312. In such embodiments, the network control entity 312 can determine that the forwarding-state information 370 is associated with a different virtual switch fabric system and, accordingly, discard the forwarding-state information 370.

After the current forwarding-state information 370 has been distributed to the appropriate network control entities, a source peripheral processing device can send a data packet to a destination peripheral processing device (see, e.g., FIG. 1 and its related description). For example, a source peripheral processing device operatively coupled to the port 315 can send a data packet to a destination peripheral processing device operatively coupled to the port 327. Specifically, the source peripheral processing device operatively coupled to the port 315 can send the data packet to a data plane module of the edge device 310. The data plane module of the edge device 310 can parse the data packet to retrieve a destination identifier (e.g., an identifier of a peripheral processing device operatively coupled to the port 327). Using the destination identifier, the data plane module of the edge device 310 can query a lookup table having the forwarding-state information. The forwarding-state information can indicate to the data plane module of the edge device 310 that the destination peripheral processing device is operatively coupled to the edge device 320. In some embodiments, the data plane module of the edge device 310 can append a header having an identifier of the edge device 320. Additionally, the data plane module of the edge device 310 can further prepare (e.g., classify, partition the data packet into cells, etc.) and send the data packet to the edge device 320 via a switch fabric (e.g., switch fabric 102 of FIG. 1). A data plane module of the edge device 320 can receive the data packet and prepare and send the data packet to the peripheral processing device operatively coupled to the port 327.

FIG. 6 is a flow chart illustrating a method 600 of transmitting initiation signals and forwarding-state information between edge devices using a broadcast protocol and a selective protocol, respectively, according to another embodiment. The method 600 includes sending a first signal using a broadcast protocol indicating that an edge device has been operatively coupled to a switch fabric system defining multiple virtual switch fabric systems, at 602. As discussed above, such a broadcast protocol can be similar to IS-IS, OSPF, and/or the like. In some embodiments, the first signal is sent to a fixed multicast address. Using a fixed multicast address allows a network management module having a dynamic address to receive the first signal.

A second signal is received from a network management module, at 604. A first network control entity is initiated at the edge device in response to the second signal, at 606. Additionally, the first network control entity is assigned a device identifier and a virtual switch fabric system identifier associated with a virtual switch fabric system from the multiple virtual switch fabric systems in response to the second signal, at 608. The first network control entity manages at least a portion of the edge device. In some embodiments, for example, the first network control entity manages forwarding-state information associated with at least one port at the edge device. In such embodiments, the at least one port and a peripheral processing device coupled to the at least one port can be said to be associated with the first network control entity.

Forwarding-state information associated with a peripheral processing device operatively coupled to the edge device is sent, using the first network control entity, to a second network control entity associated with the virtual switch fabric system using a selective protocol, at 610. The selective protocol can be used such that the forwarding-state information is sent to the network control entities associated with the virtual switch fabric system but not network control entities associated with other virtual switch fabric systems. Accordingly, the forwarding-state information is sent to the network control entities associated with the same virtual switch fabric system. As discussed above, in some embodiments, the selective protocol can be the Border Gateway Protocol (BGP). As such, the first network control entity and the second network control entity can be said to be BGP speakers

While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. Where methods described above indicate certain events occurring in certain order, the ordering of certain events may be modified. Additionally, certain of the events may be performed concurrently in a parallel process when possible, as well as performed sequentially as described above.

Embodiments shown and described above refer to multiple peripheral processing devices, including compute notes, storage nodes, service nodes and routers. In some embodiments, one or more of the compute nodes can be general-purpose computational engines that can include, for example, processors, memory, and/or one or more network interface devices (e.g., a network interface card (NIC)). In some embodiments, the processors within a compute node can be part of one or more cache coherent domains. In some embodiments, the compute nodes can be host devices, servers, and/or so forth. In some embodiments, one or more of the compute nodes can have virtualized resources such that any compute node (or a portion thereof) can be substituted for any other compute node (or a portion thereof) operatively coupled to a switch fabric system.

In some embodiments, one or more of the storage nodes can be devices that include, for example, processors, memory, locally-attached disk storage, and/or one or more network interface devices. In some embodiments, the storage nodes can have specialized modules (e.g., hardware modules and/or software modules) configured to enable, for example, one or more of the compute nodes to read data from and/or write data to one or more of the storage nodes via a switch fabric. In some embodiments, one or more of the storage nodes can have virtualized resources so that any storage node (or a portion thereof) can be substituted for any other storage node (or a portion thereof) operatively coupled to a switch fabric system.

In some embodiments, one or more of the services nodes can be an open systems interconnection (OSI) layer-4 through layer-7 device that can include, for example, processors (e.g., network processors), memory, and/or one or more network interface devices (e.g., 10 Gb Ethernet devices). In some embodiments, the services nodes can include hardware and/or software configured to perform computations on relatively heavy network workloads. In some embodiments, the services nodes can be configured to perform computations on a per packet basis in a relatively efficient fashion (e.g., more efficiently than can be performed at, for example, a compute node). The computations can include, for example, stateful firewall computations, intrusion detection and prevention (IDP) computations, extensible markup language (XML) acceleration computations, transmission control protocol (TCP) termination computations, and/or application-level load-balancing computations. In some embodiments, one or more of the services nodes can have virtualized resources so that any service node (or a portion thereof) can be substituted for any other service node (or a portion thereof) operatively coupled to a switch fabric system.

In some embodiments, one or more of the routers can be networking devices configured to connect at least a portion of a switch fabric system (e.g., a data center) to another network (e.g., the global Internet). In some embodiments, for example, a router can enable communication between components (e.g., peripheral processing devices, portions of the switch fabric) associated with a switch fabric system. The communication can be defined based on, for example, a layer-3 routing protocol. In some embodiments, one or more of the routers can have one or more network interface devices (e.g., 10 Gb Ethernet devices) through which the routers can send signals to and/or receive signals from, for example, a switch fabric and/or other peripheral processing devices.

Some embodiments described herein relate to a computer storage product with a non-transitory computer-readable medium (also can be referred to as a non-transitory processor-readable medium) having instructions or computer code thereon for performing various computer-implemented operations. The computer-readable medium (or processor-readable medium) is non-transitory in the sense that it does not include transitory propagating signals per se (e.g., a propagating electromagnetic wave carrying information on a transmission medium such as space or a cable). The media and computer code (also can be referred to as code) may be those designed and constructed for the specific purpose or purposes. Examples of non-transitory computer-readable media include, but are not limited to: magnetic storage media such as hard disks, floppy disks, and magnetic tape; optical storage media such as Compact Disc/Digital Video Discs (CD/DVDs), Compact Disc-Read Only Memories (CD-ROMs), and holographic devices; magneto-optical storage media such as optical disks; carrier wave signal processing modules; and hardware devices that are specially configured to store and execute program code, such as Application-Specific Integrated Circuits (ASICs), Programmable Logic Devices (PLDs), Read-Only Memory (ROM) and Random-Access Memory (RAM) devices.

Examples of computer code include, but are not limited to, micro-code or micro-instructions, machine instructions, such as produced by a compiler, code used to produce a web service, and files containing higher-level instructions that are executed by a computer using an interpreter. For example, embodiments may be implemented using Java, C++, or other programming languages (e.g., object-oriented programming languages) and development tools. Additional examples of computer code include, but are not limited to, control signals, encrypted code, and compressed code.

While various embodiments have been described above, it should be understood that they have been presented by way of example only, not limitation, and various changes in form and details may be made. Any portion of the apparatus and/or methods described herein may be combined in any combination, except mutually exclusive combinations. The embodiments described herein can include various combinations and/or sub-combinations of the functions, components and/or features of the different embodiments described. 

What is claimed is:
 1. An apparatus, comprising: a network management module to be operability coupled to a plurality of edge devices that are coupled to a plurality of peripheral processing devices, the network management module to receive a signal associated with a broadcast protocol substantially similar to the Intermediate System to Intermediate System (IS-IS) protocol from an edge device from he plurality of edge devices in response to that edge device sending the signal to the network management module and the plurality of edge devices such that the plurality of edge devices store information contained in the signal when that edge device is operatively coupled to a switch fabric, the network management configured to provision that edge device in response to receiving the signal, the network management module to define a plurality of network control entities at the plurality of edge devices such that each network control entity from the plurality of network control entities is to provide forwarding-state information associated with at least one peripheral processing device from the plurality of peripheral processing devices to at least one remaining network control entity from the plurality of network control entities using a selective protocol substantially similar to the Border Gateway Protocol (BGP).
 2. The apparatus of claim 1, wherein each network control entity from the plurality of network control entities is associated with a virtual switch fabric system from a plurality of virtual switch fabric systems and is to provide forwarding-state information associated with the at least one peripheral processing device from the plurality of peripheral processing devices to at least one remaining network control entity from the plurality of network con associated with that virtual switch fabric system.
 3. The apparatus of claim 1, wherein a network address of the network management module is dynamic.
 4. The apparatus of claim 1, wherein the edge device from the plurality of edge devices is configured to send the signal to a fixed multicast address using the broadcast protocol.
 5. The apparatus of claim 1, wherein the network management module is to assign a unique device identifier to the edge device from the plurality of edge devices in response to receiving the signal from the edge device.
 6. The apparatus of claim 1, wherein each edge device from the plurality of edge devices operatively coupled to the remaining edge devices from the plurality of edge device via the switch fabric, the switch fabric defines a single logical hop between each edge device pair from the plurality of edge devices.
 7. The apparatus of claim 1, wherein a first edge device from the plurality of edge devices is to send data to a peripheral processing device from the plurality of peripheral processing devices operatively coupled to a second edge device from the plurality of edge devices using forwarding-state information received at the first edge device from a network control entity from the plurality of network control entities associated with the peripheral processing device.
 8. The apparatus of claim 1, wherein the network management module is further configured to modify a status of a network control entity from the plurality of network control entities when a processing capacity of the network control entity crosses a threshold.
 9. The apparatus of claim 1, wherein the network management module is further configured to terminate a network control entity from the plurality of network control entities when a processing capacity of the network control entity falls below a threshold.
 10. A non-transitory processor-readable medium storing code representing instructions to cause a processor to: send a first signal to a network management module and a plurality of edge devices such that the plurality of edge devices store information contained in the first signal, the first signal indicating that an edge device from the plurality of edge devices has been operatively coupled to a switch fabric system defining a plurality of virtual switch fabric systems, the first signal being based on a broadcast protocol substantially similar to the Intermediate System to Intermediate System (IS-IS) protocol; receive a second signal from a network management module, the second signal causing the edge device to initiate a first network control entity at the edge device, the second signal assigning to the first network control entity a device identifier and a virtual switch fabric system identifier associated with a virtual switch fabric system from the plurality of virtual switch fabric systems, the first network control entity to manage at least a portion of the edge device; and send, using the first network control entity, forwarding-state information associated with a peripheral processing device operatively coupled to the edge device to a second network control entity associated with the virtual switch fabric system, using a selective protocol substantially similar to the Border Gateway Protocol (BGP).
 11. The non-transitory processor-readable medium of claim 10, wherein the code representing instructions to cause a processor to send the first signal includes code representing instructions to cause the processor to address the first signal using a fixed multicast address.
 12. The non-transitory processor-readable medium of claim 10, wherein a network address of the network management module is dynamic.
 13. The non-transitory processor-readable medium of claim 10, wherein the edge device is a first edge device, the switch fabric system defining a single logical hop between the first edge device and a second edge device operatively coupled to the switch fabric system.
 14. The non-transitory processor-readable medium of claim 10, wherein the edge device is a first edge device, the second network control entity is to manage at least a portion of a second edge device, the second edge-device to send data to the peripheral processing device using the forwarding-state information sent to the second network control entity.
 15. A system, comprising: a plurality of edge devices associated with a network and to be operatively coupled to a switch fabric and a plurality of peripheral processing devices, a first edge device from the plurality of edge devices to send a broadcast signal to a plurality of devices associated with the network when the first edge device is initially coupled to the network, the plurality of devices including the plurality of edge devices such that the plurality of edge devices store information contained in the broadcast signal; a network management module to automatically provision the first edge device from the plurality of edge devices in response to receiving the broadcast signal, the broadcast signal associated with a broadcast protocol substantially similar to the Intermediate System to Intermediate System (IS-IS) protocol, the network management module defining a first network control entity at the first edge device from the plurality of edge devices and a second network control entity at a second edge device from the plurality of edge devices, a first set of peripheral processing devices from the plurality of peripheral processing devices being associated with the first network control entity, a second set of peripheral processing devices from the plurality of peripheral processing devices being associated with the second network control entity, the first network control entity to send forwarding-state information associated with the first set of peripheral processing devices to the second network control entity using a selective protocol substantially similar to the Border Gateway Protocol (BGP).
 16. The system of claim 15, wherein the first network control entity and the second network control entity are associated with a first virtual switch fabric system, the network management module defining a third network control entity at a third edge device from the plurality of edge devices, the third network control entity being associated with a second virtual switch fabric system, the management module restricting the first network control entity from sending forwarding-state information associated with the first set of peripheral processing devices to the third network control entity.
 17. The system of claim 15, wherein; the first edge device from the plurality of edge devices is configured to send data to the remaining edge devices from the plurality edge devices via the switch fabric, and the switch fabric defines a single logical hop between edge device pairs from the plurality of edge devices.
 18. The system of claim 15, wherein a network address of the network management module is dynamic.
 19. The system of claim 15, wherein the first edge device from the plurality of edge devices is to send the broadcast signal to a fixed multicast address.
 20. The system of claim 15, wherein the network management module is to assign a unique device identifier to the first edge device from the plurality of edge devices in response to receiving the signal from the first edge device. 